NBS Source
Top Hats

Application

Suitable for use in sheds, light industrial and commercial buildings when used as a secondary member supporting roof or wall cladding.

Description

Top Hats are alternative to purlins or girts and are ideal where greater roof spans are required. They are manufactured from high-tensile galvanised steels or ZINCALUME® steel, with features including:

  • Quick installation.
  • Easily fixed with self-piercing fasteners.
  • Straight and true.
  • Termite and bora proof.
  • Fire resistant.
  • Easy to handle and store.
  • Available in a range of spans and gauges.
  • Available in both ZINCALUME® and galvanised steels.

General information

Material

Steel.

Shape

Rectangle.

Uniclass 2015

Pr_20_76_51_21 Cold-formed galvanized steel sections

Primary

SpecPack

05400 Cold Formed Metal Framing

NATSPEC National Classification System

0342 Light steel framing

SpeedSpec

05400 Cold Formed Metal Framing (Load Bearing)

Specification data - Cold-formed galvanized steel sections Enhanced data

Material

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Standard

To AS/NZS 4600.

Designation

G550.

Thickness

0.75 mm.

0.95 mm.

1.15 mm.

Corrosion protection

-

Standard

To AS 1397.

Class

AZ150.

Material

ZINCALUME® steel.

Galvanised steel.

Size

64 mm (depth) x 107.25 mm (width).

96 mm (depth) x 109 mm (width).

120 mm (depth) x 141 mm (width).

MassDensity

Varies depending on profiled and base metal thickness.

1.223 – 1.957 kg/m (64 mm profile).

1.93 – 3.08 kg/m (120 mm profile).

Span

Standard spans for 64 mm and 96 mm profiles range from 1500 mm to 6000 mm. For 120 mm profiles, spans range from 2000 mm to 6000 mm only.

1500 mm.

1750 mm.

2000 mm.

2250 mm.

2500 mm.

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End laps

To achieve structural lap, minimum overlap length should be 15% of the span, i.e. 7.5% at each end. For non-structural laps, minimum overlap should be 100 mm in length.

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Weather conditions

Contact manufacturer for guidance if to be used within 1 km of industrial, chemical, marine or corrosive environments.

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Compatibility

Never use on or in conjunction with lead, copper, bare metal, stainless steel, mortar, concrete, green and some chemically treated timbers.

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Literature

Ceiling Battens, Roof Battens & Top Hats Design Manual

Ceiling Battens, Roof Battens & Top Hats Design Manual